package org.project.controller2;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Formatter;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;

//获得jsapi_ticket之后，就可以生成JS-SDK权限验证的签名了
public class sign {
	@SuppressWarnings("rawtypes")
	public static Map<String, String> sign(String jsapi_ticket, String url) {
		Map ret = new HashMap();
		String nonce_str = create_nonce_str();
		String timestamp = create_timestamp();
		String signature = "";
		String string1 = "jsapi_ticket=" + jsapi_ticket + "&noncestr="
				+ nonce_str + "&timestamp=" + timestamp + "&url=" + url;
		try {
			MessageDigest crypt = MessageDigest.getInstance("SHA-1");
			crypt.reset();
			crypt.update(string1.getBytes("UTF-8"));
			signature = byteToHex(crypt.digest());
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		ret.put("url", url);
		ret.put("jsapi_ticket", jsapi_ticket);
		ret.put("nonceStr", nonce_str);
		ret.put("timestamp", timestamp);
		ret.put("signature", signature);
		return ret;
	}

	private static String byteToHex(byte[] hash) {
		Formatter formatter = new Formatter();
		byte[] arrayOfByte = hash;
		int j = hash.length;
		for (int i = 0; i < j; i++) {
			byte b = arrayOfByte[i];
			formatter.format("%02x", new Object[] { Byte.valueOf(b) });
		}
		String result = formatter.toString();
		formatter.close();
		return result;
	}

	private static String create_nonce_str() {
		return UUID.randomUUID().toString();
	}


	
	private static String create_timestamp() {
		return Long.toString(System.currentTimeMillis() / 1000L);
	}
}
